Cell selection method and device

Abstract

A cell selection method and a device for reducing resource waste are disclosed. The cell selection method includes: a terminal device determining a candidate measurement channel according to geographical location information, satellite orbit information of one or more satellites in a service area where the terminal device is located, and a correspondence between the satellite orbit information and satellite frequency bands used by the one or more satellites, the geographical location information is for indicating geographical location coordinates where the terminal device is currently located, and the satellite orbit information includes orbital data information and/or identification information of the one or more satellites; performing a cell measurement on the candidate measurement frequencies to obtain measurement results; and selecting or re-selecting a target cell which meets a first preset condition based on a measurement result meeting the first preset condition in the measurement results.

What is claimed is: 
     
       1. A cell selection method, comprising:
 determining, by a terminal device, candidate measurement frequencies according to geographical location information, satellite orbit information of one or more satellites in a service area where the terminal device is located, and a correspondence between the satellite orbit information and frequency bands used by the one or more satellites; wherein the geographical location information is for indicating geographical location coordinates where the terminal device is currently located, and the satellite orbit information comprises orbital data information and/or identification information of the one or more satellites; 
 performing, by the terminal device, a cell measurement on the candidate measurement frequencies to obtain measurement results; and 
 selecting or re-selecting, by the terminal device, a target cell which meets a first preset condition based on a measurement result meeting the first preset condition in the measurement results. 
 
     
     
       2. The method according to  claim 1 , wherein said performing, by the terminal device, the cell measurement on the candidate measurement frequencies to obtain measurement results comprises:
 performing, by the terminal device, a cell reselection measurement on the candidate measurement frequencies to obtain the measurement results based on that relevant parameters of a cell where the terminal device currently resides or the geographical location coordinates meet a second preset condition. 
 
     
     
       3. The method according to  claim 2 , wherein said performing, by the terminal device, the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results based on that relevant parameters of the cell where the terminal device currently resides or the geographical location coordinates meet the second preset condition comprises:
 performing, by the terminal device, the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when signal quality of the cell where the terminal device currently resides is less than first preset signal quality; or 
 performing, by the terminal device, the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when an elevation angle of a beam corresponding to a signal of the cell is less than a preset elevation angle; or 
 performing, by the terminal device, the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when a Doppler shift of a beam corresponding to a signal of the cell is greater than a preset frequency shift value; or 
 performing, by the terminal device, the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when a vertical distance between the geographical location coordinates and a boundary of a cell corresponding to any one of the candidate measurement frequencies is less than a preset distance; 
 wherein the first preset signal quality, the preset elevation angle, the preset frequency shift value and/or the preset distance are pre-configured in the terminal device or broadcast by a network device to the terminal device through system information. 
 
     
     
       4. The method according to  claim 1 , wherein said re-selecting, by the terminal device, the target cell which meets the first preset condition based on the measurement result meeting the first preset condition in the measurement results comprises:
 when a target cell with signal quality greater than second preset signal quality belongs to cells corresponding to the candidate measurement frequencies, re-selecting, by the terminal device, the target cell; or 
 when a target cell of which signal quality is greater than third preset signal quality belongs to cells corresponding to the candidate measurement frequencies, and a duration for which the signal quality is greater than the third preset signal quality is maintained for a first preset time length, re-selecting, by the terminal device, the target cell; or 
 when signal quality of a cell where the terminal device currently resides is less than fourth preset signal quality and a target cell with signal quality greater than fifth preset signal quality belongs to cells corresponding to the candidate measurement frequencies, re-selecting, by the terminal device, the target cell; or 
 when signal quality of a cell where the terminal device currently resides is less than sixth preset signal quality, a target cell of which signal quality is greater than seventh preset signal quality belongs to cells corresponding to the candidate measurement frequencies, and a duration for which the signal quality of the target cell is greater than the seventh preset signal quality is maintained for a second preset time length, re-selecting, by the terminal device, the target cell; or 
 when there is a target cell having an overlapping coverage area with a cell where the terminal device currently resides among cells corresponding to the candidate measurement frequencies, re-selecting, by the terminal device, the target cell; or 
 when there is a target cell having an overlapping coverage area with a cell where the terminal device currently resides among cells corresponding to the candidate measurement frequencies, signal quality of the target cell is greater than eighth preset signal quality and a duration for which the signal quality of the target cell is greater than the seventh preset signal quality is maintained for a third preset time length, re-selecting, by the terminal device, the target cell; or 
 when a target candidate measurement frequency corresponding to more than one cell belongs to the candidate measurement frequencies, re-selecting, by the terminal device, a target cell with longest service time of the target candidate measurement frequency; 
 wherein the second preset signal quality, the third preset signal quality, the fourth preset signal quality, the fifth preset signal quality, the sixth preset signal quality, the seventh preset signal quality, the eighth preset signal quality, the first preset time length, the second preset time length and/or the third preset time length are pre-configured in the terminal device or broadcast by a network device to the terminal device through system information. 
 
     
     
       5. The method according to  claim 1 , wherein said selecting, by the terminal device, the target cell which meets the first preset condition based on the measurement result meeting the first preset condition in the measurement results comprises:
 selecting, by the terminal device, the target cell when there is a target cell with signal quality meeting S criterion among cells corresponding to the candidate measurement frequencies. 
 
     
     
       6. The method according to  claim 1 , wherein said performing, by the terminal device, the cell measurement on the candidate measurement frequencies to obtain measurement results comprises:
 performing, by the terminal device, a cell measurement on the candidate measurement frequencies continuously to obtain the measurement results; or 
 performing, by the terminal device, the cell measurement on the candidate measurement frequencies in a preset period to obtain the measurement results; 
 wherein the preset period is pre-configured in the terminal device or broadcast by a network device to the terminal device through system information. 
 
     
     
       7. A non-transitory computer storage medium, storing computer executable instructions which are configured to cause a computer to perform the method of  claim 1  when running on the computer. 
     
     
       8. A cell selection method, comprising:
 configuring, by a network device, a first preset condition for a terminal device; 
 sending, by the network device, the first preset condition to the terminal device, wherein the terminal device performs a cell measurement on candidate measurement frequencies to obtain measurement results after determining the candidate measurement frequencies according to geographical location information, satellite orbit information of one or more satellites in a service area where the terminal device is located, and a correspondence between the satellite orbit information and frequency bands used by the one or more satellites, and selects or re-selects a target cell which meets the first preset condition based on a measurement result meeting the first preset condition in the measurement results; wherein the geographical location information is for indicating geographical location coordinates where the terminal device is currently located, and the satellite orbit information comprises orbital data information and/or identification information of the one or more satellites. 
 
     
     
       9. The method according to  claim 8 , wherein, the first preset condition comprises preset signal quality, a preset elevation angle, a preset frequency shift value, or a preset distance. 
     
     
       10. A terminal device, comprising:
 a memory configured to store instructions; 
 a processor configured to read the instructions stored in the memory to perform the process of: 
 determining candidate measurement frequencies according to geographical location information, satellite orbit information of one or more satellites in a service area where the terminal device is located, and a correspondence between the satellite orbit information and frequency bands used by the one or more satellites; wherein the geographical location information is for indicating geographical location coordinates where the terminal device is currently located, and the satellite orbit information comprises orbital data information and/or identification information of the one or more satellites; 
 performing a cell measurement on the candidate measurement frequencies to obtain measurement results; and 
 controlling the terminal device to select or re-select a target cell which meets a first preset condition based on a measurement result meeting the first preset condition in the measurement results. 
 
     
     
       11. The terminal device according to  claim 10 , wherein when performing the cell measurement on the candidate measurement frequencies to obtain the measurement results, the processor is configured to:
 perform a cell reselection measurement on the candidate measurement frequencies to obtain the measurement results based on relevant parameters of a cell where the terminal device currently resides or the geographical location coordinates meet a second preset condition. 
 
     
     
       12. The terminal device according to  claim 11 , wherein when performing the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results based on the relevant parameters of the cell where the terminal device currently resides or the geographical location coordinates meet the second preset condition, the processor is configured to:
 perform the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when signal quality of the cell where the terminal device currently resides is less than first preset signal quality; or 
 perform the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when an elevation angle of a beam corresponding to a signal of the cell is less than a preset elevation angle; or 
 perform the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when a Doppler shift of a beam corresponding to a signal of the cell is greater than a preset frequency shift value; or 
 perform the cell reselection measurement on the candidate measurement frequencies to obtain the measurement results when a vertical distance between the geographical location coordinates and a boundary of a cell corresponding to any one of the candidate measurement frequencies is less than a preset distance; 
 wherein the first preset signal quality, the preset elevation angle, the preset frequency shift value and/or the preset distance are pre-configured in the terminal device or broadcast by a network device to the terminal device through system information. 
 
     
     
       13. The terminal device according to  claim 10 , wherein when controlling the terminal device to re-select a target cell which meets a first preset condition based on a measurement result meeting the first preset condition in the measurement results, the processor is configured to:
 when a target cell with signal quality greater than second preset signal quality belongs to cells corresponding to the candidate measurement frequencies, control the terminal device to re-select the target cell; or 
 when a target cell of which signal quality is greater than third preset signal quality belongs to cells corresponding to the candidate measurement frequencies, and a duration for which the signal quality of the target cell is greater than the third preset signal quality is maintained for a first preset time length, control the terminal device to re-select the target cell; or 
 when signal quality of a cell where the terminal device currently resides is less than fourth preset signal quality and a target cell with signal quality greater than fifth preset signal quality belongs to cells corresponding to the candidate measurement frequencies, control the terminal device to re-select the target cell; or 
 when signal quality of a cell where the terminal device currently resides is less than sixth preset signal quality and there is a target cell of which signal quality is greater than seventh preset signal quality belongs to cells corresponding to the candidate measurement frequencies, and a duration for which the signal quality of the target cell is greater than the seventh preset signal quality is maintained for a second preset time length, control the terminal device to re-select the target cell; or 
 when there is a target cell having an overlapping coverage area with a cell where the terminal device currently resides among cells corresponding to the candidate measurement frequencies, control the terminal device to re-select the target cell; or 
 when there is a target cell having an overlapping coverage area with a cell where the terminal device currently resides among cells corresponding to the candidate measurement frequencies, signal quality of the target cell is greater than eighth preset signal quality and a duration for which the signal quality of the target cell is greater than the seventh preset signal quality is maintained for a third preset time length, control the terminal device to re-select the target cell; or 
 when a target candidate measurement frequency point corresponding to more than one cell belongs to the candidate measurement frequencies, control the terminal device to re-select a target cell with longest service time of the target candidate measurement frequency point; 
 wherein the second preset signal quality, the third preset signal quality, the fourth preset signal quality, the fifth preset signal quality, the sixth preset signal quality, the seventh preset signal quality, the eighth preset signal quality, the first preset time length, the second preset time length and/or the third preset time length are pre-configured in the terminal device or broadcast by a network device to the terminal device through system information. 
 
     
     
       14. The terminal device according to  claim 10 , wherein when controlling the terminal device to select the target cell which meets a first preset condition based on a measurement result meeting the first preset condition in the measurement results, the processor is configured to:
 control the terminal device to select the target cell when a target cell with signal quality meeting S criterion belongs to cells corresponding to the candidate measurement frequencies. 
 
     
     
       15. The terminal device according to  claim 10 , wherein when performing the cell measurement on the candidate measurement frequencies to obtain measurement results, the processor is configured to:
 perform the cell measurement on the candidate measurement frequencies continuously to obtain the measurement results; or 
 perform the cell measurement on the candidate measurement frequencies in a preset period to obtain the measurement results; 
 wherein the preset period is pre-configured in the terminal device or broadcast by a network device to the terminal device through system information.